forward_load_fromloop.ll
2.43 KB
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; RUN: opt %loadPolly -polly-stmt-granularity=bb -polly-optree -analyze < %s | FileCheck %s -match-full-lines
;
; Forward a the LoadInst %val into %bodyB. %val is executed multiple times,
; we must get the last loaded values.
;
; for (int j = 0; j < n; j += 1) {
; double val;
; for (int i = 0; i < n; i += 1) {
; bodyA:
; val = B[j];
; }
;
; bodyB:
; A[j] = val;
; }
;
define void @func(i32 %n, double* noalias nonnull %A, double* noalias nonnull %B) {
entry:
br label %for
for:
%j = phi i32 [0, %entry], [%j.inc, %inc]
%j.cmp = icmp sle i32 %j, %n
br i1 %j.cmp, label %bodyA, label %exit
bodyA:
%i = phi i32 [0, %for], [%i.inc, %bodyA]
%B_idx = getelementptr inbounds double, double* %B, i32 %i
%val = load double, double* %B_idx
%i.inc = add nuw nsw i32 %i, 1
%i.cmp = icmp slt i32 %i, %n
br i1 %i.cmp, label %bodyA, label %bodyB
bodyB:
%A_idx = getelementptr inbounds double, double* %A, i32 %j
store double %val, double* %A_idx
br label %inc
inc:
%j.inc = add nuw nsw i32 %j, 1
br label %for
exit:
br label %return
return:
ret void
}
; CHECK: Statistics {
; CHECK: Known loads forwarded: 1
; CHECK: Operand trees forwarded: 1
; CHECK: Statements with forwarded operand trees: 1
; CHECK: }
; CHECK: After statements {
; CHECK-NEXT: Stmt_bodyA
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_bodyA[i0, i1] -> MemRef_B[i1] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 1]
; CHECK-NEXT: [n] -> { Stmt_bodyA[i0, i1] -> MemRef_val[] };
; CHECK-NEXT: Instructions {
; CHECK-NEXT: %val = load double, double* %B_idx, align 8
; CHECK-NEXT: %i.cmp = icmp slt i32 %i, %n
; CHECK-NEXT: }
; CHECK-NEXT: Stmt_bodyB
; CHECK-NEXT: ReadAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: ;
; CHECK-NEXT: new: [n] -> { Stmt_bodyB[i0] -> MemRef_B[n] };
; CHECK-NEXT: MustWriteAccess := [Reduction Type: NONE] [Scalar: 0]
; CHECK-NEXT: [n] -> { Stmt_bodyB[i0] -> MemRef_A[i0] };
; CHECK-NEXT: Instructions {
; CHECK-NEXT: %val = load double, double* %B_idx, align 8
; CHECK-NEXT: store double %val, double* %A_idx, align 8
; CHECK-NEXT: }
; CHECK-NEXT: }